Nantoka/성실seongsilIntermediate성실 (seongsil) is a Korean word meaning “faithfulness; sincerity”.Meanings1faithfulness2sincerityPart of speechnounHanja誠實Related words사실fact사실actually정성heart불확실being uncertain확실하다certain확실히certainly현실reality현실적being realistic현실적realistic진실truth실체substance실천practiceStudy Korean with flashcards →